Smoke-consuming furnace.



N0. 721,698. PATENTED MAR. 3, 1903. y J. B. HARRIS.

SMOKE GONSUMING FURNACE.

APPLICATION FILED APR. 2, 1902.

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No. 721,698. PATENTED MARJ3, 1903.

\J. B. HARRIS. SMOKE GONSUMING FURNACE.

APPLIQATION FILED APR. 2, 1902- 3 SHEETS-SHEET 2 Emit; iwfiiin q M M ii:I r mi Emmi? V w r mum 3:; i .Z n .DDDU 7 w 1:": WI 4/ mw fl m/W Um i: qL Uu 51 n n n n u n n u u n W m 2 T H ununuumnn w v N, 2F 2K l u u o o on o0 o o u a u o no J. B. HARRIS. sMoKE GONSUMING FURNAG APPLICATIONFILED APR. 2, 1902. a SHEETS-SHEET s Q I I WITNESSES: a Q

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UNITED STATES PATENT OFFICE.

JOHN BROWN HARRIS, OF NASHVILLE, TENNESSEE. I

SMOKE-CONSU MING FURNACE.

EPECIFICATION forming part of Letters Patent N 0. 721,698, dated March3, 1903. Application filed April 2, 1902. Serial No- 101,069. (Nomodel.) A

description.

The invention relates to furnaces for use on boilers, stoves, openfire-grates, kitchen stoves and ranges, and the like; and its object isto provide a new and improved smoke-consunning furnace which is simpleand durable V in construction, very efiective in operation, and arrangedto utilize the units of heat contained in the fuel to thefnllestadvantage to insure complete combustion. v

The invention consists of novel features and parts and combinations ofthe same, as will be more fully described hereinafter and then pointedout in the claims.

A practical embodiment of the invention is represented in theaccompanying drawings, forming a part of this specification, in whichsimilar characters of reference indicate corresponding parts in all theviews.

Figure l is a sectional side elevation of the improvement as applied toa stove. Fig. 2 is an enlarged sectional plan view of the same on theline2 2 of Fig. 1. Fig. 3 is an enlarged sectional side elevation of thefilling-chute, parts being in a different position. Fig. 4 is a frontelevation of the improvement as applied to an open fire-grate, partsbeing broken out. Fig. 5 is a transverse section of the same on the line5 5 of Fig. 4:. Fig. 6 is a longitudinal sectional elevation of theimprovement as applied to a boiler. Fig. 7 is a sectional plan view ofthe same on the line 7 7 of Fig. 6, and Fig. 8 is a transverse sectionof the same ontheline 8 8 of Fig. 6.

The stove or heater illustrated in Figs. 1 2, and 3 consists,essentially, of a fire-box A, preferably made in the form of an invertedfrustum of a cone, opening at its apex end into the ash-pit B, the topplate A of the said fire-box beingprovided with a central opening Aleading into the combustionchamber 0, having an opening 0 in its crownto conduct the heat arising from the burning fuel in the fire-box A intoa shell D, concentrically surrounding the combustion-chamber O-andconnected at its lower end with the chimney-flue E, the upper end of thesaid shell having a damper connection F with the saidchimney-fiue E toproduce adirect draft in the combustion-chamber on starting the fire inthe fire-box A. The damper connection F is closed after the fire isstarted in the In the fire-clay wall of the fire-box A is arranged ahot-air-supply pipe G, preferably in the form of a coil and having itslower end G extending to the outside of the heater, the outer end beingpreferably provided with a valve H to open the pipe end G to theatmosphere or to close the said pipe end whenever desired. The inner endof the supplypipe G opens into an annular chamber I, formed in the topplate A of the fire-box A, and the said annular chamber I is connectedby inwardly-extending radial branch pipes J with the lower ends ofvertically-disposed perforated pipes K, arranged in a circle andsomewhat spaced apart, as plainly indicated in Fig. 2, the perforationsin the tubes K extending on the lateral faces thereof, so as to causethe hot air topass into the path of the smoke and gases arising from thefirebox A through the central opening A as indicated by the arrows inFig. 2. The perforated tubes K support at their upper ends adeflector-plate L to cause the heat to spread in'the lower portion ofthe combustion-chamber C before passing to the crown outletopeuing C.The fuel isintroduced into the .fire-box A through a ohuteN, extendingin an inclined direction from the top plate A through the lower portionof the combustionchamber 0 and shell D, the outer end of the said chutebeing normally closed by a cap 0 in the shape of a scoop and hinged at Oto the bottom of the chute, at the upper end thereof. The cap 0 isconnected by a linkP with a gate Q, hung at its upper end'at Q" in thechute N, so as to close the latter at the time the cap 0 is open, andwhen the cap is swung into a closed position the link P swings the gateQ open, as indicated inFig. 1. Now in order to charge the fire-box withfuel the latter-is placed into the open cap 0, (see Fig. 3,) and thenthe cap is swung into a closed position, as shown in Fig. 1, so that thefuel slides down the chute N into the fire-box loo without any danger ofcold atmospheric air passing into the fire-box during the introductionof the charge into the fire-box.

In starting the fire in the fire-box the valve H is closed and thedamper F is opened, and after the fuel is burning in the fire-box thedamper F is closed and the valve H is opened, so that atmosheric airpassing through the pipe G becomes heated, as the pipe is heated fromthe burning fuel in the fire-box heating the wall thereof. The heatedair from the pipe G passes into the annular chamber I and through thebranch pipes J, so as to be heated to a still higher degree, thehighlyheated air finally passing through the perforations in the tubes Kto the smoke and gases arising through the opening A so that a completecombustion of the smoke and gases takes place in the combustion-chamberO by the introduction of the highly-heated air. The heat now passesthrough the crown-opening 0 into the shell D and down the latter aroundthe outside of the combustion-chamber G, to finally pass into thechimney-flue E.

From the foregoing it is evident that the air is highly heated in itspassage through the pipe G, annular chamber 1, and branch pipes J, sothat the hot air readily produces complete combustion of the risingsmoke and gases to insure full utilization of all the units of heatcontained in the fuel in the fire-box A.

In the modified form shown in Figs. 4 and 5 the hot-air-supply pipe G isarranged in the wall R of the open grate having the firebox A theash-pit B, and the combustionchamber 0 leading at its upper end into thechimney-flue E. The lower end of the pipe G has an outward extension Gcontaining a valve H, and the upper end of the pipe G opens into achamber I, arranged in the wall R, and from the said chamber I extendthe perforated tubes K in a transverse direction and within the upperend of the combustionchamber 0 so that the heated air passing out of theperforated tubes K comes directly in contact with the smoke and gasesrising in the fire-box and combustion-chamber C so that completecombustion of the smoke and gases takes place by the introduction of thehot air.

In the modified form shown in Figs. 6, 7, and 8 the hot-airsupply pipe(l is arranged in the brickwork S, supporting the boiler T, one end G5of the pipe opening to the atmosphere and the other end opening into achamber I in the form of a coil of pipe, arranged in the top of thebridge-wall, located in the rear of the fire-box A, as plainly indicatedin Fig. 6. From the chamber I extend the perforated tubes K so that theheated air issuing through the perforations in the tubes K comes indirect contact with the smoke and gases passing over the bridge-wallthrough the combustion-chamber C to finally pass through theboiler-fines, the heat in passing through the combustion-chamber Cheating the pipe G", so that the air is highly heated at the time itleaves the tubes K As indicated in Fig. 6, the pipe G4 is arranged inthe shape of a coil, forming part of the bottom and rear of thecombustion-chamber. In all cases it is understood, however, thatatmospheric air is heated and is charged into the smoke and gasesarising from the burning fuel in the fire-box to cause completeconsumption of the smoke and gases and produce a high heat.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. A smoke-consuming furnace, compris ing a fire-box,a coiled hot-air pipe arranged in a Wall of the furnace and heated bythe burning fuel in the fire-box, said pipe opening at one end into theopen air, an air-chamber arranged in a wall of the furnace and intowhich the other end of the hot-air pipe opens, said chamber havingoppositely arranged and spaced portions forming an opening between saidportions at right angles to the passage of the chamber, andoppositely-arranged and perforated pipes projecting from the saidportions of thechamber, as set forth.

2. A smoke-consuming furnace, comprising a fire-box, acombustion-chamber, an airpipe in the wall of the fire-box, opening atone end into the open air, an annular chamber between the fire-box andthe combustion-chamher, into which opens the other end of the saidair-pipe, and perforated tubes rising in the combustion-chamber andconnected with the said annular chamber, as set forth.

3. A smoke-consuming furnace, comprising a fire-box, acombustion-chamber, an airpipe in the wall of the fire-box, opening atone end into the open air, an annular chamber between the fire-box andthe combustion-chamber, into which opens the other end of the saidair-pipe, perforated tubes rising in the combustion-chamber andconnected with the said annular chamber by branch pipes, and

a deflector-plate on the top of the said tubes, as set forth.

4. A smoke-consuming furnace, comprisinga fire-box, a combustion-chamberconnected with the fire-box by a central opening in *the top plate ofthe fire-box, a hot-air pipe in the wall of the fire-box, opening at oneend into the open air and at its other end into an annular chamberformed in the said top plate, and perforated tubes concentric to thesaid central opening, connected by branch pipes with the said annularchamber, as set forth.

5. A smoke-consuming furnace, comprising a fire-box, acombustion-chamber connected with the fire-box by a central opening inthe top plate of the fire-box, a hot-air pipe in the wall of thefire-box, opening at one end into the open air and at its other end intoan annular chamber formed in the said top plate, and perforated tubesconcentric to the said central opening, connected by branch pipes pipesextending in the said top plate, asset forth.

6. A smoke-consuming furnace, comprising a combustion-chamber, afire-box, in the form of an inverted frustum of a cone and provided witha top plate having a central opening leadingto the combustion-chamber,an annular chamber, and radial pipes extending inwardly from' the said.chamber, a plu-.

rality of perforated tubes projecting into the combustion-chamber andarranged around the central opening of the top plate of the fire-boxfthelower ends of the tubes being connected with the radial pipes, adeflectorplate on the'upper end of the'perforated tubes,

- and a pipe coiledin the wall of the fire-box 1 and having one endconnected with the said annular chamber and its other end opening intothe open air, as set forth.

7. A smoke-consuming furnace, comprising a fire-box having a coiled pipearranged in its wall, and provided with a top plate having a centralopening, an annular chamber with which the other end of the coiled pipeis connected, and branch pipes leading'inwardly from the annularchamber, a combustionsame, having a hinged gate and a'hinged fuelreceiving scoop-shaped cap, the gate and cap being connected witheachother and arranged to close the gate on swinging the cap open,

and to open the gate on closing the cap, to dump the contents thereofinto the chute, as set forth.

In testimony whereofl have signed my name to this specification in thepresence of two subscribing witnesses.

JOHN BROWN HARRIS.

Witnesses:

F. A. DRAPER, R. H. NEAL.

